Nasal mask



FIG. 1 is a front top and left perspective view of a nasal mask showing my new design;

FIG. 2 is a left side view thereof, the right side view being a mirror image thereof;

FIG. 3 is a front side view thereof;

FIG. 4 is a rear view thereof;

FIG. 5 is a bottom plan view thereof;

FIG. 6 is a top plan view thereof; and,

FIG. 7 is an exploded view thereof. 

The ornamental design of a nasal mask, as shown and described. 